STC Core Bit Extension 1-1/4" 7 UNCSyntec core bit extension rod, 1 1 4" 7 UNC. Threaded steel extension rods for increasing the drilling depth of core bits. Hex shank for ease of fitment. Suitable for core bits over 45 mm in diameter. 1 1 4" 7 UNC thread on each end. Available in 150, 300, and 450 mm extension lengths.
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